Symmetric Electrodes for Solid Fuel Cells Based on Sr-Doped LaFe0.7Ni0.3O3-δ

Perovskite La1-xSrxFe0.7Ni0.3O3-δ with x = 0.0, 0.1 &0.2 denoted LSFNx has been investigated as potential symmetrical electrode in solid fuel cells (SOFCs). The crystal structure is in pure orthorhombic phase for x = 0.0, orthorhombic-cubic phase coexist for x = 0.1 and pure cubic phase for x = 0.2. Structural properties are studied by X-ray powder diffraction (XRPD), refined by Rietveld analysis. SEM images show the morphology of as prepared and calcined samples either the compatibility between those electrodes and LSGM electrolyte in presence of 50% wt of Ce0.8Gd0.2O2-δ, so that, lower chemical reactivity was found. Total conductivity, impedance in high, medium and low frequencies HF, MF and LF respectively, and resistance polarization (Rp) are determined in air. LaFe0.7Ni0.3O3-δ has a good response in all ranges of frequencies but La0.9Sr0.1Fe0.7Ni0.3O3-δ and La0.8Sr0.2Fe0.7Ni0.3O3-δ have response only in HF and MF and exhibit Rp values as low as LaFe0.7Ni0.3O3-δ .

• symmetric electrodes
• solid oxide fuel cells
• perovskite oxides
• strontium doping
• crystal structure
• electrode-electrolyte compatibility
• LSGM electrolyte
• Ce0.8Gd0.2O2-δ
• electrical conductivity
• impedance
• polarization resistance

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• Advancements in Solid Oxide Fuel Cells
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• symmetric electrodes
• solid oxide fuel cells
• perovskite oxides
• strontium doping
• crystal structure
• electrode-electrolyte compatibility
• LSGM electrolyte
• Ce0.8Gd0.2O2-δ
• Materials Chemistry
• Electrical and Electronic Engineering
• Materials Science
• Engineering